Induction regulator



June 5, 1928.:

D. L. ALEXANDER INDUCTION REGULATOR Filed Oct. 2, 1926 gwuentoz Quorum:

Patented June 5, 1928.

FUNITED STATES m vrn L. ALEXANDER; or CHEVY CHASE, MARYLAND.

INDUCTION REGULATOR.

' Application filed October2,

The invention relates to an induction regulator controlling the flowingof alternating currents.

The object of the present invention isto improve the construction ofinduction regulators and to provide a simple, practical and efficientdevice of strong, durable and inexpensive construction adapted to beeasily wound and readily assembled. I d

v A further object of the invent on is to provide an induction regulatoradapted to afford a completely closed magnetic circuit at all times toprevent loss of current and capable of gradually varying the inducedcurrent vfrom maximum tominimum and vice versa.

A further object of the invention is to provide an induct-ion regulatorequipped with a movablecore member provided with means of graduallyincreasing capacity to form separate paths for the magnetic flux aroundthe core of the secondary winding invarying thestrength of the; inducedcurrent from maximum to minimum and to establish an air gap in suchseparate paths toprevent the flow of the magnetic flux through the saidseparate paths and cause all of the flux to flowthrough the. core of thesecondary winding when the induction regulator is op erating at maximuminductance.

With these and other objects in view the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described illustratedin the accompanying drawings and pointed outin .the, claims hereto appended. it being under stoodthat variouschanges in the form, pro

portion and minor details ofconstruction within the scope of the claims,may be resorted to without departing from the spirit or sacrificing anyof the advantages of the invention.

. In the drawings, in which like characters of reference designatecorresponding parts in the several views:

a Fig. 1 is an elevation of an induction regulator constructed inaccordance with this invention and shown arranged for affording aninduced current of maximum strength.

i Fig. 2 is an an end elevation of thesame.

Fig. 3 is a transverse sectional view on: the

line3-3 of Fig. 1. the parts being arranged as shown in that figure.

3 In the accompanying drawing in which is illustrated thepreferredembodimentof the invention, the induction regulator comprises 1 in itsconstruction a fixed core memberl,

1926. Serial No. 139,130.

having a primary winding 2 and a movable .core member 3 carrying asecondary winding 4. The. fixed core member is preferably of laminatedstructure and is composed of spaced sidev portions 5 and a connectingtransverse end portion 6 on which the primary winding 2 is mounted, butthe winding may be arranged in any other desired manner and may,' aswill be readily'understood,- be reversed with respect to the movable andfixed core members. The movable core member consists of a straightlaminated bar or core and a laminated rim secured to the ends of theCore and surrounding the same'as clearly illustrated inFig. 1. Thestraight bar or body, of the movable core member is arrangeddiametrically with relation to therim or peripheral portion which isdivided by diagonal slots 7 into separate overlapping sections 8. Thestraight lami- .nated baris wound before it is assembled in the parallelrim and after being wound it is pressed into the rim which is providedat diametrically opposite points with substantially dovetailed recesses9 for the receptionof'dovetailed ends 9 of the straight bar or bodyportion of the movable core .member.

This securely interlocks and fastens the straight bar and the rimtogether and after they have been assembled in this manner, the rim issplit diagonally as illustrated in Fig. 2 of the drawing at oppositesides of the straight body portion .of the movable core member toprovide similar overlapping tapered ends for the sections 8-of the rim.The slot or cut made in the rim is of a length less than the width ofthe space between the sides or portions 5 of the fixed core member sothat when the movable core member is arranged as shown in Fig. 1 of thedrawing with its straight core portion in parallelism with thetransverse end portion 6 of the fixed core member with the primary andsecondary windings in parallelism to afford an induced current ofmaximum strength; the upper and lower portions of the rim will presentair gaps attheslots or cuts 7, and will prevent the magnetic fiux fromflowing through the upper. and lower portions of the rim and cause allof the fluxes to flow through the straight body portion of the movablecore member and afford a maximum efficiency with minimum loss or leakageof the magnetic flux through the upper and lower portions of the rim.

is mounted tot-urn on a central pivot or axis 10 is partially rotated,one dtthe tapered ends of the lower portion of the rim-willbe carriedinto Contact with-the other: sid-e por tion of. the fixed core member.These overlapping end portions 8 of the sectionsiof'the rim tapercircumferentially and provide portions of gradually varying capacity forv 0rtion and a gradual re'd-uction in the strengthottheinduced current.{By this construction, there is no sudden *diminut-ion or increase in"the strengthof the induced current -and the induced current may bevarie'd from maximum to Pminimum in this 'gradua'l manner; and when *theunovdble -core meinber is rotated to a 'positionat 90" to tha't-in whichit is illustrated 1 in Fig. 1 of 39 the drawing-the secondary'winding'will be al-ranged at right angles to the primary *winding and 'therewill be noflow ofcurrent through -tl1e secondary winding and "no loss(if jcurrentthroughleaka:ge--df magnetic flux. "The spaced side portionsof the fixed core inember are *provided with concave bearing faces "'11,which conform to the configuration of the outer peripheral bearing {faceof the rim and it willlee 'app'are'nt that there is contact at -zilltimes "between the :movable 1 core-member and the spaced side "portionsof the fixed core member toprovide at "all times :a closed magneticcircuit,- and that the iii "slots :or cuts 7 are "arranged to form airgapsin the side portionsof the rim 'to prevent-the magnetic flux fromliowi-ng through such side portions when thein'duct-ionreguila'tor' isarnanged t'o operate at maximum :efliciency. I

Ihc movable core member-has mounted on its pivot or shift "10, a *worm'wheel 12 f which meshes with'theworm 13 of asha ft 145provided withacrankdiandle 15" or other suitable means for rotating the shat-ft 1% to:adj ust the 'rotary core member. "Theshaft l 'ismdunted insuitableibearings lfi and the wo'rm gear :will operate to firmly hold.the :movable core member in its adjustment and resist any tendency of:the movable "core EJ119111- her to rotate under the action of theprimary current. lheshafts an'd gearing for adjusting the 'mov able coreunenlben are designed to be made of* bronze-, brass on other inonqnagnetic gmaterial. 'The l-eads or 'wires 17'and 18 of 65 t-heprimary winding are connected with a suitable source of current supplywand the wires 19 and 20 of the secondary winding -carrythe load in thearrangement shown 1n =E-ig.s-l,'rbut ins-addition to the reversingposition of the primary and secondary windings,

ithesprimany winding may take the form of I terial so that neithertheside p'lates nor'the gearing will afiorda path'lor the magnetic 'fiuxand'interferewiththe operation ot th'e device.

'lVhatfis claimed is: j

1. An induction regulator including -a magnetic circuit consisting of afixed core member having spaced sides and carrying a winding a movablemember having a peripheral portion contacting with the spaced sides ineach adjustment otthe 'movable core 7 member to provide a completelyclosedmagnetic circuit of approximatelythe same cross section .at alltimesyand a diametrically-"arranged member carrying a winding.

.12; An induction regulator including Ba .7

*fi'xed 1core :member 'having spaced sides. a movable core membercomposed-of substantially straight'body portiona'nd .a rim.

contacting with the sides otthefixed core member, said straightportion"lbeingiiar- .ranged diametrically With .rela'tion' to the *rimand'thelaltter maintaining a constantly closed magnetic circuit betweenthe fixed and -movable members. andjprimaryand secondary windings on thesaid members",

'3. An induction regulator in c'zluding a fixed core member havingspacedsides, a 'movable core member composed of a .sub-

stantially straight bodyportion and a rim cont-acting with thesides ofthe fixed core member, said straight portion being arrangeddiametrically with relationutolthe rimandthe latter maintaining aconstantly closed magnetic 'circuitbetwee'n the 'fixed. and movablemembers, said run beingisplit'to;

"form 'anLair gap located between the side port1onsof.,the fixed coremember when the regulator is operatmg at maximum efiicienthe said coremembers.

4. An induction regulator inc1uding- -a "contacting with'the sides ot'the fixed core member, said "straight portion being arrangeddiametrically wlth relation to the cy, and "primary. and secondarywindings on.

rim and the latter maintaining a constantly closed magnetic circuitbetween the fixed and movable members, said rim being split diagonallyto provide correspondingly tapered overlapped portions arranged to forman air gap, and primary and secondary windings on the said core,members.

5.'An induction regulator including a fixed core member having spacedsides, a movable core member composed of a substantially straight bodyportion and a rim contacting with the sides of the fixed core member,said straight portion being arranged diametrically with relation to therim and the latter maintaining a constantly closed magnetic circuitbetween the fixed and movable members, said rim being provided atopposite sides of the straight portion with diagonal cuts forming airgaps, said cuts being of a length less than the space between the sideportions of the fixed core member, and primary and secondary windings onthe said core members.

6. An induction regulator including a magnetic circuit consisting of afixed core member having spaced sides and a movable core member composedof a circular rim and a straight bar arranged diametrically withrelation to the rim, said rim contacting with the spaced portions andsplit at opposite sides of the straight portion to provide air gaps whenthe device is operating at maximum efiiciency, said straight portionhaving its ends interlocked with the rim.

7. An induction regulator including a magnetic circuit containing afixed core memberhaving spaced sides, a movable core comprisinganannular member and a diamertically arranged connecting member. saidannular member having opposite peripheral portions arranged to contactwith the spaced sides of the fixed core member for providing separatepaths for the magnetic flux, and primary and secondary windings on thecore members, the winding on the movable core member being locatedbetween the said peripheral portions.

In testimony whereof I have hereunto set my hand.

DAVID L. ALEXANDER.

